Card 1 of 20
What was the oxygen content of Earth's early atmosphere?
A
It contained mostly oxygen.
B
It contained some oxygen.
C
It contained little or no oxygen.
D
It contained high levels of oxygen.
Card 1 of 20
9.1.3 How oxygen increased Flashcards
20 flashcards on AQA GCSE Chemistry 9.1.3 How oxygen increased: the key terms, definitions and equations you need to recall for Paper 1 and Paper 2.